Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"Audio coding"”.
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Audio coding and identification for an interactive television application
This thesis describes the development of the audio coding and identification algorithms for an Interactive Video Data Service (IVDS) system. The overall purpose of the IVDS system that is discussed in this thesis is to provide the user with a wireless return path to the host site. The information …
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Low delay audio coding based on logarithmic spherical vector quantization
… for the transmission and storage of speech and audio signals are nowadays based on digital technology. For specific applications, e.g., wireless microphones for live concerts, however, operation constraints are defined which only analog technology could fulfill. The most critical and often …
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Study of the audio coding algorithm of the MPEG-4 AAC standard and comparison among implementations of modules of the algorithm
Audio coding is used to compress digital audio signals, thereby reducing the amount of bits needed to transmit or to store an audio signal. This is useful when network bandwidth or storage capacity is very limited. Audio compression algorithms are based on an encoding and decoding process. In the …
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Nonuniform subbard coding of high quality audio signals employing frequency warping
… in this thesis investigates the area of subband coding of high quality digital audio signals. The research into the application of a nonuniform filter bank employing frequency warping to digital audio coding is described. Firstly, some aspects of psychoacoustics, especially masking effects, are …
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Stereophonic Acoustic Echo Cancellation: Theory and Implementation
… In Paper IV it is shown how a perceptual audio coder may decrease this correlation and thereby increase the performance of the stereophonic acoustic echo canceler. Paper V investigates the possibilities of using joint subband filterbanks or time to frequency-domain transforms for echo …
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Encoding a Hidden Digital Signature Using Psychoacoustic Masking
… transmitting hidden digital information in the audio of commercials. Over the course of three years such a communication method was successfully developed, the hardware systems to realize the application were designed and built, and several full-scale field tests were conducted. The novel coding …
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Efficient coding of natural sounds
… Informationsverarbeitung. Eine verbesserte Audioqualität, insbesondere bei niedrigen Bitraten, wurde in dem Audiokodierungsverfahren MPEG-2/4 AAC erreicht durch den Austausch der modifizierten diskrete Kosinustransformation (MDCT) durch ein verschiebungsinvariantes spärliches Signalmodel …
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Wireless speech and audio communications
… Shannon’s separation theorem in practical speech/audio systems motivates the employment of joint source and channel coding techniques. Thus, considerable efforts have been invested in designing various types of joint source and channel coding schemes. This thesis discusses two different types of …
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Investigation of beliefs relating to weight gain prevention behaviours and weight related constructs in first year female students at three South African Universities
… only. Data analysis was conducted using the audio coding option on Nvivo Version 12. Core belief themes that emerged reflect awareness of recommendations of behaviours of weight gain prevention, awareness of benefits of performance of these behaviours, awareness of consequences of not meeting …
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Audio computing in the wild: frameworks for big data and small computers
… in the database are noisy signals; collaborative audio enhancement from hundreds of user-created clips of a music concert; an event detection system running in a small device that has to process various sensor signals in real time; a lightweight custom chipset for speech enhancement on hand-held …